On 31 October 2020, anonymous ftp access will officially be discontinued at CDDIS. Beginning August 10, 2020, CDDIS will bandwidth limit ALL IPs using anonymous ftp to just 250KB/s transfer rates. CDDIS is STRONGLY recommending all users begin to transition to using alternate method of access to the CDDIS archive. Examples of alternate methods can be found at: https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html.

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Welcome to the CDDIS-Caster NTRIP broadcaster

The CDDIS caster is operated by NASA GSFC in support of the IGS Real-time Service (RTS).

The intention of the CDDIS NTRIP caster is to disseminate Broadcast Corrections for GNSS satellite orbits and clocks in real-time in RTCMv3 format. Details about GNSS product streams are available through the caster's Source table. Information on connecting to the CDDIS Caster, streams that we carry, and client configuration is available.

For receiving streams via NTRIP in real-time you may use the BKG NTRIP Client (BNC). This is a multi-stream client software designed to run on a variety of platforms. It can retrieve data from any NTRIP supporting Broadcaster. BNC handles the HTTP communication and is able to transfer received GNSS products to a serial or IP port to feed your application.

All of the product streams on this NTRIP caster are protected. Authorization is a two step process

1. Register for a Earthdata Login account: registration with our NASA colleagues at EOSDIS.

2. Complete the CDDIS registration form found here

Contact the help email address if you have any other questions.

The CDDIS real-time data caster is provided freely to all users. The IGS RTS and the CDDIS make no assurances, implied or otherwise, for the accuracy or availability of the Service. The Service can have outages and degradations in accuracy and these events can render the Service unsuitable for any use. The Subscriber shall indemnify, defend and hold the CDDIS and its affiliates harmless from any loss or damage resulting from any claim by any person relating to the data services provided through the Service. The user will be required to acknowledge these terms of service when registering for the Service.

Map depicting locations of sites with real-time data streams available through the CDDIS caster.

Locations of sites for which real-time data streams are available through the CDDIS caster.

For more information: